New seismic images of the Lucky Strike slow-spreading segment of the Mid-Atlantic Ridge show thick lower crust at the center ...

In some areas, the plates move away from each other, forming new bits of crust, as seen at mid-ocean ridges. In other areas, called convergent boundaries, one plate dives beneath another ...

As it cools down, the lava creates a long line of mountains under the ocean called the Mid-ocean Ridge - the longest mountain range on Earth. The longest mountain range on land is the Andes in ...

That ridge, it was later discovered, extended through the major oceans of the world. It is now called the Mid-Ocean Ridge. In 1953, American physicists Maurice Ewing (1906-1974) and Bruce Heezen ...